Serological study of healthcare workers in four different hospitals in Madrid (Spain) with no previous history of COVID-19
Fabián Vázquez Rivas, Sandra Nieto Schwarz, Jaime Villarreal Carreño, Ámbar Deschamps Perdomo, Ghino Patricio Villanueva, Mayra Garrafa, M Teresa del Campo
Occupational and Environmental Medicine Aug 2021, 78 (8) 600-603; DOI: 10.1136/oemed-2020-107001